zmirror: Configure zmirror server to not use neskaya.

Per request from Camilla Fox.

(imported from commit e9754236cf886ec09ce57dc0f125d6a70f24e3f3)

servers/puppet/modules/zulip/files/zephyr-clients.debathena

@@ -0,0 +1,3 @@
+# This file is automatically rewritten by the zephyr-clients post-install
+# script.  So treat it right.
+zhm_args="-f z1.mit.edu z3.mit.edu"

servers/puppet/modules/zulip/manifests/zmirror.pp

@@ -31,6 +31,14 @@ class zulip::zmirror {
     source => "puppet:///modules/zulip/cron.d/zephyr-mirror",
   }
 
+  file { "/etc/defaults/zephyr-clients.debathena":
+    ensure => file,
+    owner  => "root",
+    group  => "root",
+    mode => 644,
+    source => "puppet:///modules/zulip/zephyr-clients.debathena",
+  }
+
   # TODO: Do the rest of our setup, which includes at least:
   # Building python-zephyr after cloning it from https://github.com/ebroder/python-zephyr
   # Putting tabbott/extra's keytab on the system at /home/zulip/tabbott.extra.keytab